Transactions of the Japan Society of Mechanical Engineers. A最新文献_第6页

Effect of Loading Rate and Tempering Temperature on Fracture Toughness of Hydrogen-Charged Low Alloy Steel SCM440 加载速率和回火温度对充氢低合金钢SCM440断裂韧性的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.483

Hideya Iikemlya, M. Kubota, Yoshiyuki Komdo

{"title":"Effect of Loading Rate and Tempering Temperature on Fracture Toughness of Hydrogen-Charged Low Alloy Steel SCM440","authors":"Hideya Iikemlya, M. Kubota, Yoshiyuki Komdo","doi":"10.1299/KIKAIA.77.483","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.483","url":null,"abstract":"J - R curves under continuous hydrogen charge were obtained to evaluate the effect of absorbed hydrogen on fracture toughness of SCM440 low alloy steel. The effect of absorbed hydrogen, loading rate and tempering temperature were investigated. Five materials which were tempered at different temperature to change Vickers hardness were used. Continuous hydrogen charge, which isolated the crack tip from the electrolyte and kept the crack in dry condition, was conducted during the test. Material hardness and loading rate significantly affected J - R curves and JIC. Low loading rate and high hardness resulted in drastically decreased JIC. The materials which were tempered at 803K showed 90% reduction of JIC compared with that of uncharged specimen. The significant reduction was experienced in materials with Vickers hardness higher than 310. Quasi-cleavage fracture surface was predominantly observed in the tests which resulted in low JIC. It is indicated that the hardness of low alloy steel used as a structural material should be limited below 300 on the viewpoint of fracture toughness. This study showed that low loading test that lasts for eighty hours at least is necessary to assess the JIC of hydrogen charged material.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116561762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evaluation of Interfacial Strength of Copper Thin Film on Printed Circuit Board with Micro Cutting System 用微切割系统评价印刷电路板上铜薄膜的界面强度

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.970

M. Omiya, I. Nishiyama

引用次数: 1

Effect of surface character on proliferation and adhesion of l929 fibroblast 表面性状对1929成纤维细胞增殖和粘附的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.544

A. Nagat, S. Miyata, M. Saito, J. Komotori, S. Obi, Yoji Naiviba, Tadayoshi Koyaivia

引用次数: 2

Proposition of a crystal plasticity constitutive equation based on crystallographic misorientation theory 基于晶体错取向理论的晶体塑性本构方程的提出

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.1081

H. Kuramae, Y. Ikeya, H. Morimoto, H. Sakamoto, T. Katayama, E. Nakamachi

{"title":"Proposition of a crystal plasticity constitutive equation based on crystallographic misorientation theory","authors":"H. Kuramae, Y. Ikeya, H. Morimoto, H. Sakamoto, T. Katayama, E. Nakamachi","doi":"10.1299/KIKAIA.77.1081","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.1081","url":null,"abstract":"In this study, we try to reveal the relationship between the plastic deformation and the microscopic crystal misorientation evolution by using the homogenized finite element (FE) procedure with the proposed crystal plasticity constitutive equation. Since plastic deformation of polycrystal sheet metal is greatly affected by its initial and plastic deformed textures, multi-scale FE analysis based on homogenization theory with considering micro polycrystal morphology is required. We formulated a new crystal plasticity constitutive equation to introduce not only the effect of crystal orientation distribution, but also the size of crystal grain and/or the effect of crystal grain boundary for the micro FE analysis. The hardening evolution equation based on strain gradient theory was modified to consider curvature of crystal orientation by using crystallographic misorientation theory. We employed two-scale structure, such as a microscopic polycrystal structure and a macroscopic elastic/plastic continuum. Our analysis code predicts the plastic deformation of polycrystal metal in macro-scale, and simultaneously crystal texture and misorientation evolutions in the micro-scale. The crystallographic misorientation evolution induced by the plastic deformation of polycrystal aluminum alloy was investigated by using the multi-scale FE analysis with new proposed hardening evolution equation. We confirmed the availability of our analysis code employing the new constitutive equation through the comparison with numerical and experimental results of uniaxial tensile problem.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"17 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120814389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Relative-Story Displacement Sensor for Structural Health Monitoring Capable of Measuring the Local Inclination Angle and the Relative Displacement 一种能够测量局部倾角和相对位移的结构健康监测相对层位移传感器

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.736

I. Matsuya, R. Katamura, Maya Sato, Hideaki Kondo, M. Iba, K. Kanekawa, Y. Nitta, T. Tanii, S. Shoji, A. Nishitani, I. Ohdomari

引用次数: 0

A multiscale crystal plasticity simulation on ultrafine-graining based on dislocation patterning 基于位错图的超细晶化多尺度晶体塑性模拟

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.448

Y. Aoyagi, Ryotaro Kobayashi, K. Shizawa

{"title":"A multiscale crystal plasticity simulation on ultrafine-graining based on dislocation patterning","authors":"Y. Aoyagi, Ryotaro Kobayashi, K. Shizawa","doi":"10.1299/KIKAIA.77.448","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.448","url":null,"abstract":"Ultrafine-grained metals whose grain size is less than one micron have attracted interest as high strength materials. However, a mechanism of ultrafine-graining based on evolution of dislocation structures has not been clarified. In this study, we derive reaction-diffusion equations for dislocation patterning of dislocation cell structures and subgrains. In order to express the generation of dislocation pattern responding to deformation progress, information of slip rate and stress and effect of interactions between slip systems on formation of cell structures are introduced into the reaction rate coefficients of reaction-diffusion equations. Moreover, we propose a multiscale crystal plasticity model based on dislocation patterning. Then we carry out two-dimensional FE-FD simulation for severe compression of FCC polycrystal using the present model. Some processes of ultrafine-graining, i.e., generation of dislocation cell structures, subgrains, dense dislocation walls and lamella subdivisions with high angle boundary is numerically reproduced, and we investigate the effect of dislocation behaviors on the processes of ultrafine-graining.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125996074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Plasma nitriding behavior of pure iron pre-treated with fine particle peening 细颗粒强化预处理纯铁的等离子体渗氮行为

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.1367

S. Kikuchi, T. Fukuoka, J. Komotori

{"title":"Plasma nitriding behavior of pure iron pre-treated with fine particle peening","authors":"S. Kikuchi, T. Fukuoka, J. Komotori","doi":"10.1299/KIKAIA.77.1367","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.1367","url":null,"abstract":"In this study, the effect of a hybrid surface modification process; combination of fine particle peening (FPP) and plasma nitriding, on microstructure of pure iron was investigated. Surface microstructures of plasma nitrided specimens pre-treated with FPP were characterized by Optical microscopy, Scanning electron microscopy (SEM), Energy dispersive X-ray spectrometer (EDX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It was clarified that the nitrided layer of the hybrid surface treated specimen was thicker than that of the nitrided one. This was because the fine grains created by FPP facilitated the nitrogen diffusion during the following nitriding process. However, no noticeable differences were observed in crystal structure of the compound layer between hybrid surface treated specimen and nitrided specimen. In order to change the crystal structure of the compound layer, FPP was performed using a chromium particle; has a strong affinity for nitrogen, prior to nitriding. The results showed that chromium nitride was generated on the treated surface during the nitriding. These results mean that the proposed hybrid surface modification process is possible to shorten the nitriding time and to change the structure of the compound layer.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128707818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Improvement of torsional fretting fatigue strength of splined shaft used for car air conditioner's compressor by hybrid joint 混合接头提高汽车空调压缩机花键轴扭转微动疲劳强度

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.208

M. Kubota, Kanetaka Miyazawa, M. Miwa, A. Tashiro, Tatsuro Aoki, Y. Kondo

引用次数: 0

ハニカムコーア材の面外弾性変形 : 第1報,ひずみエネルギーの等価性に基づく弾性定数の解析羞答答材料的面外弹性变形:第1报，基于应变能的等效性的弹性常数的分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2010-12-25 DOI: 10.1299/KIKAIA.76.1573

邦晃大石

引用次数: 0

長周期相を有するMg-Cu-Y合金の組織と機械的特性具有长周期相的Mg-Cu-Y合金的组织和机械特性

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2010-12-25 DOI: 10.1299/KIKAIA.76.1769

T. Itoi, Kazuya Takahashi, Atsurou Kimura, Mitsuji Hirohashi

引用次数: 1